The DCEM Global KPI specifies the coefficient or "Global KPI" of the eco-efficiency and energy management of data centres. It combines two indicators: one taking into account different sizes of data centre (S, M, L or XL) and a second incorporating 9 different levels of performance, similar to the energy classification model used for home appliances.

ETSI said its work will allow benchmarking of data centres or ITC locations in a wide range of industrial sectors.

Verizon was hit by a widespread outage of its online customer portal and billing system on Friday and Saturday across much of the U.S. Many users were unable to log-in to their accounts and some locations reported difficulty activating new accounts.